Rif1 Proteins and Enzymes

Rif1 (Rap1-interacting factor homolog) is a protein whose primary function is in the DNA-damage response, RIF1 forms foci that colocalize with other DNA damage response factors, after induction of double-strand breaks. Rif1 localizes to double strand breaks in an ATM (ataxia telangiectasia mutated)- and 53BP1-dependent manner and functions in the intra-S-phase checkpoint that serves to slow down DNA synthesis when DNA damage has occurred.